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A filter that one can enable in an email account to prevent correspondence from someone irritating or obnoxious. Wow, that was rude—I'm definitely adding him to my bozo filter now.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a setting on an internet email reader that will filter out selected annoying people. (Refers to bozo, a jerk.) Welcome to my bozo filter, jerk!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.